I'm so glad you have joined and now want to add to your yorkie family....two are better than one
Please consider a rescue yorkie for your Pebbles. There are many to be rescued and saving a yorkie life is the most rewarding feeling ever!
Here is a link for Petfinder, there are several yorkie listed there.
Yorkshire Terrier, Kingsburg, CA: Adoptable Pets: Petfinder
Good luck!